linked open data: opportunities & barriers for archives
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Linked Open Data: Opportunities & Barriers for Archives. Archives 360, Society of American Archivists Chicago, USA 26 th August 2011. Adrian Stevenson LOCAH Project Manager UKOLN, University of Bath, UK. - PowerPoint PPT PresentationTRANSCRIPT
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Linked Open Data: Opportunities & Barriers for Archives
Adrian StevensonLOCAH Project Manager
UKOLN, University of Bath, UK
Archives 360, Society of American ArchivistsChicago, USA
26th August 2011
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The goal of Linked Data is to enable people to share structured data on the Web as easily as they can share documents today.Bizer/Cyganiak/Heath Linked Data Tutorial, linkeddata.org
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Linked Data Design Issues
• URIs• LD Design Issues• Triples
http://www.w3.org/DesignIssues/LinkedData.html
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Triples• Triples statements– ‘Things’ have ‘properties’ with ‘values’– Subject – Predicate - Object
• Triples are the basis of RDF and Linked Data
ArchivalResource
Repository Provides Access To
The Rolling Stones
Keith Richards Is Member Of
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LOCAH Project• Linked Open Copac and Archives Hub
• Funded by #JiscEXPO 2/10 ‘Expose’ call– 1 year project. Started August 2010
• Partners & Consultants:– UKOLN, Mimas, Eduserv, Talis, OCLC, Ed
Summers
• http://blogs.ukoln.ac.uk/locah/
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What is LOCAH Doing?
• Part 1: Exposing Archives Hub & Copac data as Linked Data
• Part 2: Creating a prototype visualisation
• Part 3: Reporting on opportunities and barriers
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ArchivalResource
Finding Aid
EAD Document
Biographical History
Agent
Family Person Place
Concept
Genre Function
Organisation
maintainedBy/maintains
origination
associatedWith
accessProvidedBy/providesAccessTo
topic/page
hasPart/partOf
hasPart/partOf
encodedAs/encodes
Repository(Agent)
Book
Place
topic/page
Language
Level
administeredBy/administers
hasBiogHist/isBiogHistFor
foaf:focus Is-a associatedWith
level
Is-a
language
ConceptScheme
inScheme
ObjectrepresentedBy
PostcodeUnit
Extent
Creation
Birth Death
extent
participates in
TemporalEntity
TemporalEntity
at time
at time
product of
in
Archives Hub Model
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We’re Linking Data!• If something is identified, it can be linked to• We take items from our datasets and link them
to items from other datasets
BBCVIAF
DBPediaArchives Hub
Copac
GeoNames
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Enhancing our data• Already have some links:– Time - reference.data.gov.uk URIs– Location - UK Postcodes URIs and Ordnance Survey URIs – Names - Virtual International Authority File• VIAF matches and links widely-used authority files -
http://viaf.org/– Names - DBPedia
• Also looking at:– Subjects - Library Congress Subject Headings and
DBPedia– Open Calais for entity extraction – from ‘bioghist’ field
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http://data.archiveshub.ac.uk/
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http://data.archiveshub.ac.uk/id/person/nra/webbmarthabeatrice1858-1943socialreformer
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Visualisation Prototype• Using Timemap –
– Googlemaps and Simile
– http://code.google.com/p/timemap/
• Early stages with this• Will give location and
‘extent’ of archive.• Will link through to
Archives Hub
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Key Benefit of Linked Data• API based mashups work against a fixed
set of data sources• Hand crafted by humans• Don’t integrate well
• Linked Data promises an unbound global data space• Easy dataset integration• Generic ‘mesh-up’ tools
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Linked Open Data
• Data can be open or closed• Linked Data can be open or
closed• Most benefit gained when data is
open
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Some challenges
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Data Modelling• Steep learning curve–RDF terminology “confusing”– Lack of archival examples
• Complexity–Archival description is hierarchical and
multi-level• ‘Dirty’ Data
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Sustainability• Can you rely on data sources long-term? • Ed Summers at the Library of Congress
created http://lcsh.info• Linked Data interface for LOC subject
headings• People started using it
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Library of Congress Subject Headings
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Scalability / Provenance
Example by Bradley Allen, Elsevier at LOD LAM Summit, SF, USA, June 2011
• Same issue with attribution• Solutions: Named graphs? Quads? • Best Practice
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Licensing
• Ownership of data often not clear• Hard to track attribution• CC0 for Archives Hub and Copac
data
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Is Linked Data the Way?
• Enables ‘straightforward’ integration of wide variety of data sources
• Archival data can ‘work harder’• New channels into your data• Researchers are more likely to discover
sources • ‘Hidden' archives collections of become of the
Web
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Attribution and CC License • Sections of this presentation adapted from materials created
by other members of the LOCAH Project• This presentation available under creative commons Non
Commercial-Share Alike:
http://creativecommons.org/licenses/by-nc/2.0/uk/